The Ourea were primordial deities in Greek mythology, children of Gaia alone. They represented the mountains of the world that was known to Greeks at the time. The ten Ourea were Aitna, Athos, Helikon, Kithairon, Nysos, Olympus 1, Olympus 2, Oreios, Parnes, and Tmolus. The individual mountains were rarely personified, with the exception of Tmolus that was both a king and a mountain. Each mountain had its own local mountain nymph, called oread.